package com.atguigu.java2;

import com.atguigu.java1.Person;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class MethodTest {
    @Test
    public void test1() {
        Class clazz = Person.class;

        // 获取当前运行时类及其所有父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for (Method method : methods) {
            System.out.println(method);
        }
        System.out.println();

        // 获取当前运行时类中声明的所有方法，不包含父类
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method method : declaredMethods) {
            System.out.println(method);
        }
    }

    /**
     * 权限修饰符，返回值类型，方法名(参数1，参数2) throws Exception{}
     */
    @Test
    public void test2() {
        // 1. 获取方法声明的注解
        Class clazz = Person.class;
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method method : declaredMethods) {
            // 获取方法声明的注解
            Annotation[] annos = method.getAnnotations();
            for (Annotation a : annos) {
                System.out.println(a);
            }

            // 2.权限修饰符
            System.out.print(Modifier.toString(method.getModifiers()) + "\t");

            // 3.返回值类型
            System.out.print(method.getReturnType().getName() + "\t");

            // 4.方法名
            System.out.print(method.getName());
            System.out.print("(");

            // 5. 形参列表
            Class[] parameterTypes = method.getParameterTypes();
            if (!(parameterTypes == null || parameterTypes.length == 0)) {
                for (int i = 0;i < parameterTypes.length; i++) {
                    if (i == parameterTypes.length - 1) {
                        System.out.print(parameterTypes[i].getName() + " args_" + i);
                        break;
                    }
                    System.out.print(parameterTypes[i].getName() + " args_" + i + ", ");
                }
            }
            System.out.print(")");

            // 6. 抛出异常
            Class[] exceptionTypes = method.getExceptionTypes();
            if ( !(exceptionTypes == null || exceptionTypes.length == 0)) {
                System.out.print(" throws ");
                for (int i = 0; i < exceptionTypes.length; i++) {
                    if (i == exceptionTypes.length - 1) {
                        System.out.print(exceptionTypes[i].getName());
                        break;
                    }
                    System.out.print(exceptionTypes[i].getName() + ", ");
                }
            }

            System.out.println();
        }
    }
}
